Contact Us Now
Name can't be empty
Email error!
Message can't be empty
Send Message
Estimate the magnetic dipole moment of a permanent magnet from its remanence Br and physical volume. Magnetic moment is useful for comparing total magnetic strength, far-field behavior, sensor simulations and magnetic assembly design.
The calculator assumes uniform magnetization and uses the remanence Br as an approximate basis for magnetization. It is useful for comparing magnets of different sizes and materials.
| Item | Formula | Engineering Notes |
|---|---|---|
| Magnetization | M = Br / μ0 | μ0 = 4 × π × 10^-7 H/m. M is in A/m. |
| Magnetic Moment | m = M × V = Br × V / μ0 | V is magnet volume in m³. m is in A·m². |
| Cylinder Volume | V = π × (D / 2)^2 × T | D and T are converted from mm to meters before calculation. |
| Block Volume | V = L × W × T | Useful for rectangular magnets, blocks and square magnets. |
| Ring Volume | V = π × ((OD / 2)^2 - (ID / 2)^2) × T | Use outer diameter, inner diameter and axial thickness. |
Magnetic moment is useful when the full magnet behaves like a dipole, especially at distances much larger than the magnet size. It is less suitable for predicting near-surface field or direct pull force by itself.
Values below are approximate reference values for quick calculation only. Use material datasheet values or measured magnetic data for final engineering decisions.
| Material | Grade | Approx. Br (T) | Approx. Br (G) | Common Use |
|---|---|---|---|---|
| NdFeB | N35 | 1.17 | 11700 | General-purpose high-strength magnets |
| NdFeB | N42 | 1.29 | 12900 | Higher strength standard grade |
| NdFeB | N45 | 1.33 | 13300 | High-performance general use |
| NdFeB | N52 | 1.45 | 14500 | Maximum energy grade selection |
| SmCo | SmCo 1:5 | 0.85 | 8500 | High-temperature and corrosion-resistant applications |
| SmCo | SmCo 2:17 | 1.00 | 10000 | High-temperature motor and sensor applications |
| SmCo | SmCo 2:17 Premium | 1.10 | 11000 | Premium SmCo magnetic performance |
| Ferrite | Y25 / C5 | 0.35 | 3500 | Cost-sensitive permanent magnet applications |
| Ferrite | Y30 / C8 | 0.38 | 3800 | Common ceramic/ferrite magnet grade |
| Ferrite | Y35 | 0.40 | 4000 | Higher Br ferrite magnet selection |